用火車（排除更快的）與跑步等為計，設想出六種不同的速度與下場

來源: 走馬讀人於 2017-05-04 10:24:48 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

idea 起於Einstein 的加速度.

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